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Science China Information Sciences

Integrated optical frequency transfer and optical physical layer key distribution with enhanced link reciprocity detection

Kunfeng Xie, Liang Hu, Jianping Chen, Guiling Wu

Published Jun 24, 2024• 3 citations
Publisher
DOI
10.1007/s11432-024-4058-9

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Physical-layer secure key distribution (PLSKD) generally acquires highly correlated entropy sources via bidirectional transmission to share the channel reciprocity. For long-haul fiber links, the non-negligible backscattering noise (BSN) and the challenge of bidirectional optical amplification degrade the key generation performances. Since the channel reciprocity can be precisely mapped using neural networks (NNs), unidirectional PLSKD provides a feasible PLSKD for longer fiber links. Here, a final error-free key generation rate (KGR) in unidirectional PLSKD of 3.07 Gb/s is demonstrated over a 300 km fiber link using NNs. Moreover, the channel mapping is analyzed in terms of fiber distance, chromatic dispersion, the nonlinearity of random source, and BSN.